Indian Journal of Science and Technology
Year: 2011, Volume: 4, Issue: 11, Pages: 1396-1401
M. Daneshwar1 , NorlailiMohd Noh2 , S.Aminifar1 and Gh.Yosefi1*
1 Department of Electrical and Electronic Engineering, Mahabad Branch, Islamic Azad University, Mahabad, West Azarbayjan 591393-3137, Iran
2 Department of Electrical and Electronic Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 NibongTebal, Pulau Pinang, Malaysia
[email protected] ; [email protected]
This paper proposes a digital fuzzifier with 7 bit resolution. To achieve a high performance, the A/D conversion and fuzzification operation are done simultaneously on the same functional block, through a programmable membership function. To implement the idea we have used flash method for the 4 LSBs which results in high speed conversion. Although the 4 bit converting is adequate for most practical applications, we take advantage from successive approximation technique to achieve better precision, if needed. The proposed converter allows a significant amount of silicon area to be saved compared to fully parallel A/D. Result of extracting of the 7 bit A/D converter shows that the size of converter’s layout is less than 0.02 mm2 in 0.35µm CMOS standard technology. Moreover, the Hspice simulation showed that it can achieve 25 MHz speed and total power dissipation is 5mw in the aforementioned technology.
Keywords: Analog-to-digital converter, current mode, fuzzifier, thermometer, successive approximation
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